This also affects me. I did a fresh install of Ubuntu MATE 21.10. I can
also confirm that the procedure detailed by Norbert (nrbrtx) works to
bring back the functional indicator icon.
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Public bug reported:
Information:
1. Distribution Release: Ubuntu MATE 21.04
2. Package: mate-control-center 1.24.2-0ubuntu1
3. Theme: Yaru-MATE-dark
Expected result: Window controls (buttons) for all themes retain HiDPI scaling
after reboot.
Actual result: When using HiDPI and either the